I was looking at the explanation of #7 on page 114, and the question I have is that in determining which quantity is larger Quantity A being 2raised to the 30 minus 2 raised to the 29 all of which is divided by 2 vice Quantity B which is simply 2 raised to the 28. In step two, why do you subtract 2 raised to the 29 from both sides when you can simply subtract 29 from 30 since they have the same base? In that case can't you say it is 2 raised to the 1 and that it is less than 2 raised to the 29?
Thanks,
Anisha